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High performance RADIOEAR B-81 Bone Conductor

For audiometry and more accurate hearing diagnostics

RADIOEAR B-81 technical data:

  • High maximum output, low distortion
  • Very robust product
  • Dimensions: H 16 mm, L 31.7 mm, W 18.2 mm
  • Weight: 20 g
  • Sensitivity: 118 dB re.1 µN @ 1 Vrms & 1 kHz
  • Total Harmonic Distortion: 1% @ 1 Vrms & 1 kHz
  • Impedance: 12.5 ohm @ 1 kHz
  • Secured plug

NB: Measurements performed on Brüel & Kjær 4930, Artificial Mastoid with static force 5,4N.

For inquiries and supply of BC 81 please contact info@radioear.us.

Scientific Paper

Please retrieve your copy of the SCIENTIFIC PAPER presented at the S2 workshop, 30 October, 2013, Chalmers, Gothenburg, Sweden: A New Audiometric Bone Conductor B81 for more accurate hearing diagnostics.

The objective was to evaluate the electro-acoustic performance of the new audiometric bone vibrator Radioear B81 (Radioear Corporation, New Eagle, PA, USA). Comparison was made with the present Radioear B71 that has some well-known limitations at low frequencies.

Co-authors: Karl Johan Fredén Jansson*, Bo Håkansson*, Leif Johannsen** & Tomas Tengstrand***.
* Department of Signals and Systems, Chalmers University of Technology, Göteborg, Sweden, **Ortofon A/S, Denmark, ***Hörselverksamheten & The Sahlgrenska Academy, Göteborg University, Göteborg, Sweden

More information:

  • Microtech innovation and the culture of excellence

    Since 1918, Ortofon has been a world-leader in the field of precision engineering

  • Bone Conductors - a niche product in the hearing aid market

    Ortofon's core competences in acoustics and micromechanics are ideally suited to the manufacture of BC

  • From customer design to final product

    At Ortofon, we always strive to match the high quality of our products with high quality services